Alloy Furnace

The Alloy Furnace mixes exact amounts of metals and additives into alloys. Early recipes make alloy blends such as Bronze Blend and Steel Blend, which you then smelt in a Furnace. Stronger setups unlock direct-ingot recipes that skip the blend step, and late alloys such as Tungstensteel are only made this way.

The Alloy Furnace runs on FE and needs a Heat Core and an Alloy Crucible installed. Like every RNGTech machine, each Alloy Furnace you craft rolls its own rarity and affixes, and it can level up through Machine Mastery.

You can read an Alloy Furnace from the outside. The installed Alloy Crucible sits in a refractory well wrapped in copper induction coils. While the furnace has a recipe, a pool fills the crucible as the charge melts and drops back when the alloy pours, glowing with the crucible's heat. Each input slot has a feed hopper on the back cabinet that shows the item in it, and hoppers past the furnace's input slots are closed with a lid. An installed Servo is a stirrer over the crucible that turns while the furnace works. Facing the front, the Heat Core is the finned radiator on the left and the Battery Cell stands in the cradle on the right with its charge meter. The gas cylinder at the front left corner is the Nitrogen tank: its window shows how full it is, and its valve lights up while the crucible uses Nitrogen. The bar on the front console reads like the heat bar on the Process tab: it fills with the crucible's heat against the Heat Core's Max Temperature, a white mark shows the recipe's target and a yellow mark the setpoint, and the fill turns red while the crucible overheats. A crucible pushed past its target flickers with its wobble. The cable port is on the back.

Obtaining

Crafting

Each chassis has its own recipe. You do not need a Furnace or an earlier Alloy Furnace to craft one.

Ingredients	Crafting recipe	Notes
Bronze Alloy Furnace Chassis Bronze Ingot + Basic Electric Circuit + Bronze Heat Core + Machine Frame + Bronze Casing + Redstone Dust		Requires the Bronze material to be enabled.
Steel Alloy Furnace Chassis Steel Ingot + Advanced Electric Circuit + Steel Heat Core + Reinforced Machine Frame + Refractory Casing + Redstone Dust		Requires the Steel material to be enabled.
Titanium Alloy Furnace Chassis Titanium Ingot + Elite Electric Circuit + Titanium Heat Core + Advanced Machine Frame + Refractory Casing + Redstone Dust		Requires the Titanium material to be enabled.

Breaking

Mine a placed Alloy Furnace with a pickaxe. It drops itself and keeps its rolled traits and Mastery progress. Items inside it, including installed Gear, drop next to it.

Usage

Alloying

Put the recipe's ingredients in the input slots. Each recipe needs a set count of each ingredient, but the slot order does not matter. Extra units are fine and feed the next crafts, but every item in the input slots must belong to the recipe: one stray item stops the machine. The Alloy Furnace then heats up and starts mixing only once it reaches the recipe's target temperature. While it is out of input or out of power, it cools down. A full output slot pauses it with its heat and progress kept. Swapping an input for a different item mid-craft restarts the craft.

Each recipe also has a minimum stage. Both the chassis and the installed Alloy Crucible must reach that stage, so late alloys need a Titanium setup. The machine's max heat must also reach the recipe's target temperature. On recipes that cannot fail, its Temperature Stability must meet the recipe's requirement, or the craft does not start. See Heat for how it heats, what the FE pays for, and the overheat slider.

Your first Bronze does not need an Alloy Furnace. 3 Copper Dust, 1 Tin Dust, and 1 Coal Dust make 2 Bronze Blend in a crafting grid, in any arrangement. Once you have a Bronze Alloy Furnace, it makes more Bronze Blend from the same dusts plus Charcoal, and it can already make a slow Steel Blend bootstrap recipe.

Stage 4 and higher recipes with a failure output build up failure strain when heat or stability is off, or when power drops mid-craft on power-sensitive recipes. When strain fills, the craft fails and outputs a recoverable Malformed Ingot instead of the alloy. Smelt it in a Furnace to get two nuggets back, or keep it for the Volatile Catalyst. Of the default recipes, only Nullite and Tungstensteel can fail.

Stages

Stage	Alloy Furnace	Notes
3	Bronze Alloy Furnace Chassis	First Alloy Furnace. Makes Bronze and Steel blends.
4	Steel Alloy Furnace Chassis	Midgame chassis with Output Guard.
6	Titanium Alloy Furnace Chassis	Advanced chassis with Output Guard. Runs the late direct-ingot alloys.

Output Guard means the machine avoids working while its output is blocked. Every Alloy Furnace already keeps its progress and heat while the output slot is full.

With a Batch Size above 1, the Alloy Furnace crafts several whole recipe sets in one cycle: a batch of 3 needs three times every ingredient. A batch takes as many sets as the input slots hold and the output has room for, up to the Batch Size. Each extra set makes the cycle longer by the Batch Overhead, 25% of one craft's time to start with. Every set still absorbs its own heat and earns its own XP, and a bigger batch takes a bigger heat dip when it goes in. A failed batch ruins every set in it.

Gear

The Gear tab has four slots. No Gear can be a higher stage than the chassis.

• Heat Core (required): sets how hot the Alloy Furnace can get.
• Alloy Crucible (required): sets how many input slots are active and adds mixing control.
• Battery Cell (optional): adds portable FE storage.
• Servo (optional): adds control stats.

Alloy Crucible	Stage	Input slots
Bronze Alloy Crucible	3	3
Steel Alloy Crucible	4	3
Titanium Alloy Crucible	6	4

Automation

Side	Behavior
Top	Inserts into the active input slots. Accepts only Alloy Furnace recipe ingredients, and never lets one ingredient fill a slot another ingredient needs; see Automation.
Bottom	Extracts finished output. Ingredient leftovers are pushed into the inventory below; see Automation.
Sides	Accepts FE, for example from a Universal Cable.
Any	Accepts Nitrogen for the Nitrogen atmosphere.

Gear slots cannot be filled by automation.

Mastery and Ascendancies

Completed alloy crafts earn Alloy Furnace Mastery XP, and you spend the points on the shared Machine Mastery tree, starting from the same point as the Furnace. Failures, stalled heat, blocked output, and power-starved ticks earn nothing. Alloy Furnaces choose between the Metallurgist and Blendwright ascendancies.

The heat keystones cap Max Temperature, and every alloy needs at least 900 heat. Flash Annealing caps it at 1,000 heat, which leaves four recipes in the recipe table, and gives 100% more Processing Speed with 50% more Energy Usage. Low Heat Specialist caps it at 800 heat, which is below every alloy, and its savings only work on the Furnace, so an Alloy Furnace with it allocated cannot craft anything.

Quench Protocol halves the temperature failure strain the Alloy Furnace takes, for 25% less Heat Transfer.

Metallurgist Flux only saves a unit of an ingredient the recipe needs two or more of, so every input is still used. On a tie, it saves the ingredient listed first in the recipe.

Alloy Furnace recipes

The Alloy Furnace uses its own recipe type, rngtech:alloy_furnace. Mode tells you whether a recipe makes a blend or a finished ingot. The desiccant recipe makes Supercharged Silica Gel Beads for the Silica Gel Dehumidifier.

Input		Output	Mode	Time	Heat	Min. component stage	Min. temperature	Temperature stability	Mastery XP
34	→	2	Direct ingot	60 s	22,532 HU	6	1,400	1.12	6
34	→		Direct ingot	60 s	18,578 HU	4	1,100	1	3
3	→	3	Blend	10 s	1,582 HU	3	900	0.9	2
3	→	4	Direct ingot	10 s	1,858 HU	3	1,100	0.9	3
2	→	2	Direct ingot	60 s	15,823 HU	3	900	0.9	2
2	→	3	Direct ingot	12 s	3,282 HU	4	1,050	1	3
32	→	2	Direct ingot	60 s	25,794 HU	6	1,500	1.18	6
4	→		Direct ingot	60 s	16,522 HU	4	950	1	3
	→		Blend	90 s	23,734 HU	3	900	0.9	2
	→		Blend	60 s	18,578 HU	3	1,100	0.9	3
	→		Direct ingot	60 s	21,235 HU	3	1,300	0.9	4
	→		Direct ingot	90 s	27,867 HU	3	1,100	0.9	3
4	→		Desiccant	12 s	5,793 HU	6	1,450	0
2	→	2	Direct ingot	60 s	25,794 HU	6	1,500	1.16	6

Ascendancy trees

Every node in this machine's ascendancies. See Machine Mastery for how Seals and points work.

Metallurgist

Node	Type	After	Effect
Flux Ledger	Root	—	+10% Flux Rate.
Fluxed Charge	Small	Flux Ledger	+3% Flux Rate.
Reactive Flux	Notable	Fluxed Charge	Flux Rate is doubled on direct-ingot recipes.
Rich Flux	Small	Reactive Flux	+3% Flux Rate.
Transmuter’s Rate	Deep notable	Rich Flux	+12% Flux Rate; 25% less Processing Speed.
Steady Measure	Small	Flux Ledger	8% increased Temperature Stability.
Recipe Lock	Notable	Steady Measure	Automation inserts only the current recipe’s inputs, one craft ahead at most.
Lucky Pour	Small	Recipe Lock	+1% Super Output.
Unbroken Pour	Deep notable	Lucky Pour	Super Output Cadence fixed at 32 cycles.
Skimmed Melt	Small	Flux Ledger	8% increased Temperature Stability.
Dross Skimming	Notable	Skimmed Melt	A failure keeps one unit of the recipe’s largest input.
Banked Heat	Small	Flux Ledger	5% reduced Energy Use.
Heat Economy	Notable	Banked Heat	Heat put in before a craft starts costs 30% less FE.

Blendwright

Node	Type	After	Effect
Blend Reversal	Root	—	+25% Blend Speed. A failed direct-ingot craft returns the blend its inputs would make, never more. Direct-ingot recipes are 15% slower.
Quick Blend	Small	Blend Reversal	+5% Blend Speed.
Cold Mixing	Notable	Quick Blend	+100 °C Blend Heat Reduction.
Warm Mix	Small	Cold Mixing	+5% Blend Speed.
Continuous Pour	Deep notable	Warm Mix	Back-to-back blend crafts take no load dip.
Steady Pace	Small	Blend Reversal	6% increased Processing Speed.
Blend Ledger	Notable	Steady Pace	+25% Ledger Rate.
Measured Pace	Small	Blend Ledger	6% increased Processing Speed.
Master Blend	Deep notable	Measured Pace	100% more Ledger Rate. Direct-ingot recipes are disabled.
Even Heat	Small	Blend Reversal	8% increased Temperature Stability.
Tempered Crucible	Notable	Even Heat	40% more Temperature Stability on blend recipes.
Sure Footing	Small	Blend Reversal	8% increased Temperature Stability.
Steady Supply	Notable	Sure Footing	Power-drop failure strain is halved.

Screen

The Alloy Furnace screen has five tabs:

• Process: input and output slots, progress, energy, live heat, failure strain on recipes that can fail, and the Nitrogen gauge at the right edge. Status squares show the recipe state and whether the heat target is met. Hover for exact values. The progress tooltip also shows time remaining and expected items per minute with your Gear and Mastery applied (chance bonuses such as Super Output are not counted). With an ascendancy, a thin line under the progress bar shows Flux or blend-ledger progress, and Master Blend shows a recipe-disabled status on direct-ingot recipes.
• Gear: Heat Core, Alloy Crucible, Battery Cell, and Servo slots.
• Stats: the machine's current stats, including traits, Gear, and Mastery.
• Refinement: refine the placed Alloy Furnace's traits with a catalyst.
• Mastery: machine XP, level, and the passive tree.

Data values

Name	Resource location	Form	Translation key
Bronze Alloy Furnace Chassis	rngtech:bronze_alloy_furnace_chassis	Block	block.rngtech.bronze_alloy_furnace_chassis
Steel Alloy Furnace Chassis	rngtech:steel_alloy_furnace_chassis	Block	block.rngtech.steel_alloy_furnace_chassis
Titanium Alloy Furnace Chassis	rngtech:titanium_alloy_furnace_chassis	Block	block.rngtech.titanium_alloy_furnace_chassis

See also

• Machine Stats
• Furnace
• Crusher: makes the dusts used in blend recipes.

RNGTech wiki

Guides	Automation · Battery Cells · Dormant Machines · Gear · Getting Started · Heat · Machine Mastery · Machine Stats · Modpack Creators · Power Chains · Rarity and Affixes · Stages · Uniques
Processing	Alloy Furnace · Component Assembler · Component Recycler · Crusher · Furnace · Melter · Metal Press · Resonance Calibrator · Wooden Composter
Power generation	Bio Generator · Cavitation Generator · Corrosion Cell · Fuel Cell · Potential Reactor · Solar Panel · Solid Fuel Burner · Syngas Combustor · Vacuum Collapse Generator
Energy storage	Battery Chassis
Fluids and gases	Algae Photobioreactor · Ammonia Synthesizer · Coal Gasifier · Fluid and Compressor Tanks · Silica Gel Dehumidifier · Steam Methane Reformer · Wooden Dehumidifier
Refinement	Affix Forge · Exotic Affix Forge
Logistics	Universal Cable
Tools	Forestry Cart Station · Miner's Companion · Modular Tools · Tool Bench